Home · All Classes · Main Classes · Grouped Classes · Modules · Functions

draglabel.cpp Example File
^{draganddrop/fridgemagnets/draglabel.cpp}

 /****************************************************************************
 **
 ** Copyright (C) 2005-2008 Trolltech ASA. All rights reserved.
 **
 ** This file is part of the documentation of the Qt Toolkit.
 **
 ** This file may be used under the terms of the GNU General Public
** License versions 2.0 or 3.0 as published by the Free Software
** Foundation and appearing in the files LICENSE.GPL2 and LICENSE.GPL3
** included in the packaging of this file.  Alternatively you may (at
** your option) use any later version of the GNU General Public
** License if such license has been publicly approved by Trolltech ASA
** (or its successors, if any) and the KDE Free Qt Foundation. In
** addition, as a special exception, Trolltech gives you certain
** additional rights. These rights are described in the Trolltech GPL
** Exception version 1.2, which can be found at
** http://www.trolltech.com/products/qt/gplexception/ and in the file
** GPL_EXCEPTION.txt in this package.
**
** Please review the following information to ensure GNU General
** Public Licensing requirements will be met:
** http://trolltech.com/products/qt/licenses/licensing/opensource/. If
** you are unsure which license is appropriate for your use, please
** review the following information:
** http://trolltech.com/products/qt/licenses/licensing/licensingoverview
** or contact the sales department at [email protected].
**
** In addition, as a special exception, Trolltech, as the sole
** copyright holder for Qt Designer, grants users of the Qt/Eclipse
** Integration plug-in the right for the Qt/Eclipse Integration to
** link to functionality provided by Qt Designer and its related
** libraries.
**
** This file is provided "AS IS" with NO WARRANTY OF ANY KIND,
** INCLUDING THE WARRANTIES OF DESIGN, MERCHANTABILITY AND FITNESS FOR
** A PARTICULAR PURPOSE. Trolltech reserves all rights not expressly
** granted herein.
 **
 ** This file is provided AS IS with NO WARRANTY OF ANY KIND, INCLUDING THE
 ** WARRANTY OF DESIGN, MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
 **
 ****************************************************************************/

 #include <QtGui>

 #include "draglabel.h"

 DragLabel::DragLabel(const QString &text, QWidget *parent)
     : QLabel(parent)
 {
     QFontMetrics metric(font());
     QSize size = metric.size(Qt::TextSingleLine, text);

     QImage image(size.width() + 12, size.height() + 12,
                  QImage::Format_ARGB32_Premultiplied);
     image.fill(qRgba(0, 0, 0, 0));

     QFont font;
     font.setStyleStrategy(QFont::ForceOutline);

     QPainter painter;
     painter.begin(&image);
     painter.setRenderHint(QPainter::Antialiasing);
     painter.setBrush(Qt::white);
     painter.drawRoundRect(QRectF(0.5, 0.5, image.width()-1, image.height()-1),
                           25, 25);

     painter.setFont(font);
     painter.setBrush(Qt::black);
     painter.drawText(QRect(QPoint(6, 6), size), Qt::AlignCenter, text);
     painter.end();

     setPixmap(QPixmap::fromImage(image));
     labelText = text;
 }

 void DragLabel::mousePressEvent(QMouseEvent *event)
 {
     QByteArray itemData;
     QDataStream dataStream(&itemData, QIODevice::WriteOnly);
     dataStream << labelText << QPoint(event->pos() - rect().topLeft());

     QMimeData *mimeData = new QMimeData;
     mimeData->setData("application/x-fridgemagnet", itemData);
     mimeData->setText(labelText);

     QDrag *drag = new QDrag(this);
     drag->setMimeData(mimeData);
     drag->setHotSpot(event->pos() - rect().topLeft());
     drag->setPixmap(*pixmap());

     hide();

     if (drag->exec(Qt::MoveAction | Qt::CopyAction, Qt::CopyAction) == Qt::MoveAction)
         close();
     else
         show();
 }